Bhagavad Gita · 3.4

न कर्मणामनारम्भान्नैष्कर्म्यं पुरुषोऽश्नुते।न च सन्न्यसनादेव सिद्धिं समधिगच्छति॥

na karmaṇām anārambhān naiṣhkarmyaṁ puruṣho 'śhnute na cha sannyasanād eva siddhiṁ samadhigachchhati

A person does not attain freedom from action by abstaining from action, nor does one reach perfection merely by renunciation.

— Bhagavad Gita 3.4

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)